Gaga, who hosted the Global Citizen producers’ event, opened the two-hour television portion with an emotional performance from Charlie Chaplin’s classic “Smile”.
Lizzo wrapped up a discreet cover of Sam Cooke’s “A Change Is Gonna Come”.
Taylor Swift played the piano and sang a moving rendition of “Soon you will be better”.
Stevie Wonder paid a moving tribute to his late friend Bill Withers, singing the 1972 classic Withers “Lean on Me”.
Meanwhile, the Rolling Stones performed “You Cant Always Get What You Want”.
Jennifer Lopez wowed fans by singing “People”, which was originally performed by Barbra Streisand.
Other performers include John Legend and Sam Smith, Burna Boy, Jennifer Hudson, Billie Joe Armstrong of Green Day, Elton John, and Billie Eilish and Finneas O’Connell teamed up on “Sunny”.
At the end of the two-hour show, Lady Gaga, Céline Dion, John Legend and Andrea Bocelli ended with an amazing four-part harmony on “The Prayer”, which Dion and Bocelli recorded 21 years ago. They were accompanied by the piano virtuoso Lang Lang.
The concert was broadcast online throughout the day, then broadcast during prime time in the United States on multiple networks and cable channels at 8 p.m. ET / 5 p.m. PT. Jimmy Fallon, Jimmy Kimmel and Stephen Colbert animated the broadcast part.